Bone Armor

2nd-Level Necromancy
Casting Time: 1 Action
Range: 60 ft
Components: V, S
Duration: 1 Minute

You use the bones of your enemies to forge a buffer between you and their attacks. Target a creature that is within 60ft of you. That creature must make a Constitution saving throw, taking 3d6 piercing damage on a failed save, or half as on a success, as you violently tear several rib bones out of their chest and pull them towards you. Those bones quickly grown and reshape themselves into a protection shell around you that grants +2 to AC for the next minute. If an attack hits your AC, the bone armor shatters, and the spell ends.